MUSEUM OF COMPARATIVE ZOOLOGY. 87 
lateral constriction which makes a pointed lobe inward; length to breadth 
2.7 : 2.5. Side mouth-shields long, crooked, and very narrow, meeting within. 
First and second under arm-plates larger than those beyond, axe-shaped, 
with outer edge wide and curved, and lateral sides re-enteringly curved ; those 
beyond are similar, but present an angle inward. Side arm-plates swollen, 
broad, minutely tuberculated, meeting below, outside the disk; separated above 
by upper arm-plates, which are narrow, four-sided, much swollen, with curved 
lateral and straight outer and inner sides ; towards the middle of the arm they 
become longitudinal oval. Disk thick, smooth, and angular, covered in the centre 
by small, thin, irregular, overlapping scales, in the midst of which are the six 
primary plates, which are rounded and rather small, In each interbrachial 
space, and connecting the radial shields, is a large rounded angular plate. 
Outside of this are two large marginal plates, which extend below nearly or 
quite to the outer edge of the mouth-shield. Radial shields much rounded 
triangular, broadly meeting without, separated within by two or three 
disk-scales ; length to breadth 2: 1.7. Interbrachial spaces below covered by 
the two great marginal plates, between which and the mouth-shield there are 
sometimes two or three small scales, Genital scales rather wide, and carrying 
on the free edge a row of large, square, close-set papilla, which become spini- 
form where they form the arm-comb. Usually three, rarely four, very minute 
arm-spines, one at the top, one near the middle, and one at the lower edge of 
the side arm-plate. Three or four small rounded tentacle-scales on each side of 
first three sets of tentacle-pores ; those just beyond the disk have two or three 
scales on the inner, and two on the outer side. Color in alcohol, light gray. 
Station 216, 2000 fathoms, 2 specimens. 
Ophioglypha Lacazei sp. nov. 
Plate III. Figs. 58-60. 
Special Marks. — Three minute arm-spines, high up. Radial shields rounded, 
separated by one scale within, One large marginal plate, with small scales 
about it. Disk high. Basal under arm-plates about as long as broad. Arms 
high and rounded. 
Description of an Individual (Station 160). — Diameter of disk 11 mm. 
Length of arm about 30 mm. Width of arm close to disk 2.3 mm. Mouth- 
papillo very small and widely separated; eleven to thirteen to each angle ; 
one large at apex of jaw. Mouth-shield large, much rounded pentagonal, 
with obtuse angle inward, and outer side curved; length to breadth 2.5: 
9.5. Side mouth-shields rather short and wide, meeting within, where 
they are broader than without. First under arm-plate long, wedge-shape, 
with outer edge curved; the rest axe-shaped, with outer edge curved, and lateral 
sides re-enteringly curved, Side arm-plates regular and scarcely swollen. 
Upper arm-plates large, broader than long, hexagonal, with outer angles much 
rounded; length to breadth 1: 1.3. Farther out they become nearly semi- 
